Crumbling internal block work

Postby shockfire » Tue Mar 23, 2010 2:18 pm

Hi all,

We have a cavity wall, where the outside is clay bricks and the inside is concrete blocks.

However, in some places (seemingly randomly throughout all 3 outside walls), the concrete blocks have "dents" in them. When placing a finger in a "dent", the block begins to crumble and the dent gets bigger. There is no sign of rising damp, and nothing "feels" wet.

Does anyone know what could be causing this problem? Searched all over but cannot find any information.

Thanks for your help :),
Rank: Labourer
Progress to next rank:
Posts: 2
Joined: Tue Mar 23, 2010 1:57 pm


Simply Build It

Postby stoneyboy » Tue Mar 23, 2010 11:12 pm

I assume you are refering to aerated concrete blocks. You may have a bad batch where large air pockets have been formed in the block - you will end up with a hollow cavity.
Alternatively the block layer has used a hammer to lay the blocks and damaged the surface.
Rank: Project Manager
Posts: 2715
Joined: Wed Dec 10, 2008 6:44 pm

Display posts from previous
Sort by
Order by

  • DIY How to Project Guides

  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!


  • Related Topics